Landmarks/Minimum landmark size

From Wazeopedia
The width of either X or Y must be over 50 m (160 feet)

When creating a landmark, it is important to understand the client application will not display the landmark unless it is greater than 50 m (160 feet) when measuring the maximum size of the X or Y dimension.

If one dimension is over 50 m (160 feet), there is no requirement for the other dimension. Also the area of the landmark has no impact on whether it will display on the client app.